Unable to update modules


I have created a Intranet with Drupal for a company 2 years ago.

There is a problem now and i don’t know how to fix it.

When I try to update a module I get the following error:

Er is een AJAX HTTP fout opgetreden. HTTP-resultaatcode: 500 Debug informatie volgt. Pad: /batch?id=254&op=do Statustekst: Internal Server Error Antwoordtekst: {“status”:true,”percentage”:”100″,”message”:”1 van 1 gereed.u003Cbr /u003E”}


There is a AJAX HTTP error occured. HTTP-result code: 500 Debug information follows. Path: /batch?id=254&op=do Statustext: Internal Server Error Tesponsetext: {“status”:true,”percentage”:”100″,”message”:”1 of 1 compleet.u003Cbr /u003E”}

Does anyone know what to do?

(I’m sorry for the bad English)

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/21/feed